Paper cup.



G. J. BOHLMAN.

PAPER CUP.

TION FILED NOV. 2,1

Patented May 2, 1916.

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Specification of Letters Patent.

Patented llllay 2, 191th...

application filled November a, 1914. Serial No. M9363.

To allwhomz'tmay concern:

Be it known that I, GEORGE J. BOHLMAN, a citizen of the United States,ll/ledford, in the county of Middlesex and State of Massachusetts, haveinvented an Improvement in Pa er Cups, of which the following" is aspeci cation.

This invention relates to paper drinking cups or other paperreceptacles, and has for its object the production of a cup having animproved form of rolled-edge at either or both ends of its body. Arolled-edge at the top of the cup is of advantage as contrasted with theusual thin' shar additional stifl'ness and rigiditytothe cup, and alsopresents a smooth lip-engaging portion which will not have a tendency tocut the lip; and a rolled-edge at the bottom of the cup is also ofadvantage, as by it a stifl' flange is produced below the bottompiece,by which to support the cup in upright position, even when tilled, andby which the bottom-piece is held from dropping out, so thatbottom-pieces composed of flat disks may be employed.

Heretotore paper cups have been produced with rolled-edges, but themethods employed for producing them have been and'an era amount ofparaflin wax employed, which not only increased the expense but alsoincreased the weight oi the cups to such an extent that when the cupswere in a-pile oi, say, one hundred, the increased weight wasobjectionable. Furthermore, in warm weather the parafiin wax softened,and when several cups were nested in a pile they had a decided tendencyto stick together, so mu'chso, in fact, that cups heavily or evenmoderately coated, or having portions heavily or moderately coated withparaflin wax, could notbe' used as an all-year-round cup. Even in casethe rays of the sun were allowed to strike a pile, the araflin wax wouldnot only soften, but would run, whereupon the cups of the pile wouldweld together.

in carryin out my invention, the paper therein, and while said cup-bodyis on the form on which it is made, or on a similar form, the para isapplied to it in the term of a liquid spray, at a high temperature,which is caused to spread over its entire outside surface, and as aresult the pa residing at.

edge, as it gives.

per becomes thoroughly saturated, and is,

therefore, 1n temper, and while in such condition it can be easilystretched and bent without breaking, and, therefore, while in temper,one or both of its end-portions are subjected to a suitable bending oredgerolling-device, by which they are rolled over, thereby to produce arolled-edge at either or both ends, and then said body is allowed tocool and the parafin to set or corfigeal, whereupon the paper becomesquite sti and its rolled-edge becomes permanently set. In case the paperis thoroughly saturated with the hot or melted paraffin wax, it will befound that when congealed there is present on the surface of the paper avery thin coating. The complete satura tion of the paper isthe mainrequisite, so that it will be substantially waterproof, but the coatinwhich is present on the surface must be 0% no appreciable thickness,otherwise the cups, when nested, will have a tendency to stick together,particularly in warm weather. The roll which is formed at the I edge, isof small diameter, but is suficient for the purposes desired.

Figure 1, is a side elevation and partial longitudinal vertical. sectionof a paper drinking cup having both end portions formed with rollededges. Fig. 2, is a side elevation and partial longitudinal verticalsection of a paper drinking cup having its upper end-portion formed witha rolled edge. Fig. 3, is a side elevation of a paper cup before therolled-edges are, produced, and illustrating a spray or jet of liquidparaflin which is being directed upon the cupbody, and the molds orforms which may serve as bending-devices. Fig. 4,.is a similar View,showmg the end-portions of the cup-body rolled over.

10 represents a pa er cup-body, and 12 a.

bottom-closure there or, both of which may be of any well-known orsuitable construction. After the body is produced, it is placed on aform 15, or while reposing on the form on which it isrnade, a spray oret of melted parafin wax, indicated at 16, is

directed upon it, which is extended over' its entire surface, and whichacts to coat the body but more particularly to saturate the aper, sothat it is in good temper, andmay e easily bent without breaking. Theliquid paraffin wax in the term of a spray spatters the paper, and thenumerous spots coalesce to completely saturate the paper. He the p weits ends are rolled over by a suitable shot 11.; and bendingdevice, suchfor instance, as rep in Fig. 3, wherein a plate 20 is arrangedat thecup-body is in bottom of the form having a shallowgroove 21,semicircular in cross-section, adapted to receive the lower end of thecupbody, and by a slight downward pressure upon said body itsend-portion or edge is caused to follow *the-curvedwall of said grooveand thereby to stretch and bend out- -wardly, upwardly and'theninwardly, substantially com leting a circle, although the distance saidnd is continued may var more or less. Also, a similarl grooved gala 30,is or maybe arranged a ove the orm, the groove 31 of which receives theupper end-portion of the cup-body, as said plate and form are moved onetoward the other,

with the result that said end-portion is similarly bent. -After the bendor bends are formed the cup-bod is allowed to cool whereupon the paracongeals, and the paper is caused, to remain in the position in which itis bent, becoming ermanently set.

The paperbody with its rol ed edge or edges thus formed 18 quite stiff,and are incidentally coated with a very thin film or layer of wax ofuniform thickness, and although the rolled edge or edges areof small di-9 them to which they ameter they are sufliciently rigid to prevent beingbroken by any pressure or'stram upon and provide smooth roundedlip-engaging portions which will not have a tendency to cut thelip.

The; paper-rece tacle herein. described 7 havinga rolled e which is comletely and uniformly; saturated with para are ordinarily su j t waxmenses stance as described in my a plication No. 869,762, filedconcurrently. w th this application.

Themethod herein described forms the sub ect matter of adivisional'application #9,261 filed February 19, 1915..

I cla1m 1. A frusto-conica-l paper drinking cup having a rolled edge atthe top, sa'id cup including its rolled edge being completely saturatedwith parafiinwax, but having no .appreciable amount of paraflin wax uponits surface at any as described.

2A frusto-conical paper drinking cu having a rolled edge at the bottomwhici engages the under side of the'bottom piece, saidcup including itsrolled edge beingcompletely saturated withparaflin wax, but havpartthereof substantially mg noappreciable amount of parafiin wax upon itssurface at any part thereof, substantially as described. I

In testimony-whereof, I have] signed my name to this's'pecification, inthe presence of two subscribing witnewes.

GEORGE] 'J. BOHLMAN.

Witnesses: EmzAnn'rmM. HANSON,

Amos L. Terms.

arafiin wax may. be produced by other-met ods, as for in-

